The boltonii group (left) and the bidentata group (right)The former comprises C. boltonii, trinacriae, heros and picta.The latter comprises C. bidentata, insignis and helladica.In the boltonii group, note:1. thorax: the middle band is (relatively) well developed,2. upper appendages: close at base, then diverging, curved(as opposed to separated at the base, then straight),3. S1: the yellow spot sits at the bottom edge(as opposed to the upper segment portion), and4. anal triangle: typically five (as opposed to three) cells.